Preparation of ethyl levulinate from cellulose catalyzed by dealuminated USY molecular sieves supporting copper

doi:10.11949/j.issn.0438-1157.20160699

Abstract

Abstract:

A dealuminated Y molecular sieves supporting copper (Cu-DUSY) catalyst was prepared by impregnation technique using Cu as metallic active ingredient and modified USY molecular sieves as carrier, which USY modification was dealuminated in non-buffered citric acid. Physicochemical characterization by XRD, FT-IR, BET, NH₃-TPD, Py-IR and TG-DTA showed that the Cu-DUSY catalyst had excellent thermal stability and steady crystal structure. Cellulose alcoholysis catalyzed by Cu-DUSY yielded 48.2%(mol) of ethyl levulinate (EL) at 200℃ for 3 h. The recycled Cu-DUSY catalyst remained high activity with EL yield above 40%(mol) after being used four times.

Key words: molecular sieves, support, catalysis, alcoholysis, cellulose, ethyl levulinate

摘要：

以非缓冲体系下柠檬酸脱铝改性的USY分子筛为载体，铜为金属活性组分，采用浸渍法制备脱铝超稳Y沸石负载Cu。考察了该催化剂对纤维素醇解制备乙酰丙酸乙酯（EL）的催化活性。在反应温度为200℃、反应时间为3 h的条件下，催化纤维素转化生成EL的产率为48.2%。通过XRD、FT-IR、BET、NH₃-TPD、Py-IR和TG-DTA对催化剂进行表征，结果表明，Cu-DUSY催化剂热稳定性好，晶体结构稳定。Cu-DUSY回收利用4次EL产率仍可保持40%以上，具有较好的催化活性。

关键词: 分子筛, 载体, 催化, 醇解, 纤维素, 乙酰丙酸乙酯

CLC Number:

TQ426.95

AN Ran, KONG Pengfei, XU Guizhuan, CHANG Chun, BAI Jing, FANG Shuqi. Preparation of ethyl levulinate from cellulose catalyzed by dealuminated USY molecular sieves supporting copper[J]. CIESC Journal, 2016, 67(11): 4643-4651.

安冉, 孔鹏飞, 徐桂转, 常春, 白净, 方书起. 脱铝超稳Y沸石负载Cu催化纤维素醇解合成乙酰丙酸乙酯[J]. 化工学报, 2016, 67(11): 4643-4651.

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